public static String print(Calendar cal) {
        Date resultDate = cal.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");
        return sdf.format(resultDate);
    }

    public static void nextDate(Calendar cal) {
        cal.add(Calendar.DATE, +1);

    }

    public static String weekDay(Calendar cal) {
        String week[] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
        cal.add(Calendar.DATE, +1);
        int tmp = cal.get(Calendar.DAY_OF_WEEK);
        return week[tmp - 1];
    }

    public static void lastDate(Calendar cal) {
        cal.add(Calendar.DATE, -2);

    }

    

}

package nextDate;

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;

import nextDate.NextDate;
public class Frame {
    public static void main(String[] args) {
        final NextDate nextDate=new NextDate();
        /*
         * 界面设计
         */
        JFrame frame = new JFrame("日期计算");
        frame.setLayout(null);
        // label 初始化
        JLabel title = new JLabel("请输入需要计算的年月日");
        JLabel f_year = new JLabel("年：");
        JLabel f_month = new JLabel("月：");
        JLabel f_day = new JLabel("日：");
        JLabel thisWeek = new JLabel("这一天是：");
        JLabel nextDay = new JLabel("下一天是：");
        JLabel lastDay = new JLabel("上一天是：");
        // textfield 初始化
        final JTextField t_year = new JTextField();
        final JTextField t_month = new JTextField();
        final JTextField t_day = new JTextField();
        final JTextField t_thisWeek = new JTextField();
        final JTextField t_nextDay = new JTextField();
        final JTextField t_lastDay = new JTextField();
        // button 初始化以及设置监听事件
        final JButton submit = new JButton("确定");
        final JButton clear = new JButton("清空");
        submit.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO 自动生成的方法存根
                if (e.getSource() == submit) {
                    String Year = t_year.getText();
                    String Month = t_month.getText();
                    String Day = t_day.getText();
                    int month = 0, year = 0, day = 0;
                    year = Integer.parseInt(Year);
                    month = Integer.parseInt(Month);
                    day = Integer.parseInt(Day);
                    int tmp = nextDate.isTrueDate(year, month, day);
                    switch (tmp) {
                    case 0:
                        Calendar cal = Calendar.getInstance();
                        cal.set(year, month - 1, day);
                        nextDate.nextDate(cal);
                        t_nextDay.setText(nextDate.print(cal));
                        nextDate.lastDate(cal);
                        t_lastDay.setText(nextDate.print(cal));
                        t_thisWeek.setText(nextDate.weekDay(cal));
                        break;
                    case 1:
                        JOptionPane.showMessageDialog(null, "年份超过范围 ");
                        break;
                    case 2:
                        JOptionPane.showMessageDialog(null, "月份超过范围 ");
                        break;
                    case 3:
                        JOptionPane.showMessageDialog(null, "日期超过范围 ");
                        break;
                    }

                }
            }

        });
        clear.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO 自动生成的方法存根
                if (e.getSource() == clear) {
                    t_day.setText("");
                    t_month.setText("");
                    t_year.setText("");
                    t_nextDay.setText("");
                    t_lastDay.setText("");
                    t_thisWeek.setText("");
                }
            }
        });

        // 布局和字体设置
        Font ft = new Font("宋体", Font.PLAIN, 20);// 设置显示字体
        title.setFont(ft);
        title.setBounds(62, 62, 500, 25);
        f_year.setFont(ft);
        f_year.setBounds(80, 124, 50, 25);
        f_month.setFont(ft);
        f_month.setBounds(230, 124, 50, 25);
        f_day.setFont(ft);
        f_day.setBounds(380, 124, 50, 25);
        thisWeek.setFont(ft);
        thisWeek.setBounds(62, 248, 200, 25);
        lastDay.setFont(ft);
        lastDay.setBounds(62, 372, 150, 25);
        nextDay.setFont(ft);
        nextDay.setBounds(62, 310, 150, 25);

        t_year.setBounds(130, 124, 50, 25);
        t_month.setBounds(280, 124, 50, 25);
        t_day.setBounds(430, 124, 50, 25);
        t_thisWeek.setBounds(180, 245, 100, 25);
        t_thisWeek.setFont(ft);
        t_thisWeek.setEnabled(false);
        t_nextDay.setBounds(180, 310, 200, 25);
        t_nextDay.setFont(ft);
        t_nextDay.setEnabled(false);
        t_lastDay.setBounds(180, 372, 200, 25);
        t_lastDay.setFont(ft);
        t_lastDay.setEnabled(false);

        submit.setBounds(180, 187, 62, 31);
        clear.setBounds(320, 187, 62, 31);
        frame.add(title);
        frame.add(f_year);
        frame.add(f_month);
        frame.add(f_day);
        frame.add(thisWeek);
        frame.add(nextDay);
        frame.add(lastDay);
        frame.add(t_year);
        frame.add(t_month);
        frame.add(t_day);
        frame.add(t_thisWeek);
        frame.add(t_nextDay);
        frame.add(t_lastDay);
        frame.add(submit);
        frame.add(clear);

        frame.setSize(550, 500);
        frame.setLocation(250, 250);
        frame.setVisible(true);

  
    }
    
}